Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
huong cua » dung cua
ban cong » bang cong, phan cong, ban huong
van cong » van dong, van phong, phan cong
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu manh) or (hieu lang)) - anh huong cua ((ban cong) OR (van cong)) van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu manh) OR (hieu lang)) - anh huong cua ((ban cong) OR (van cong)) van toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu manh) or (hieu lang)) - anh huong cua ((ban cong) OR (van cong)) van toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (hieu lang)) - anh huong cua ((ban cong) OR (van cong)) van toan cao*.